Gas burner



June 21, 1955 Filed April 7. 1948 H. A. SQUIRE ETAL GAS BURNER 4Sheets-Sheet 1 June 21,1955 H. A. sQUlRE m 2,71 1

GAS BURNER 4 Sheets-Sheet 2 Filed April 7, 1948 FIG. 7

June 21, 1955 H. A. SQUIRE EI'AL 2,711,215

GAS BURNER Filed April 7, 1948 4 She etS-Sheet 5 flrraxnaya June 21,1955H. A. SQQIRE Em GAS BURNER Filed April 7, 1948 4 Sheets-Sheet 40000601000000 cocoa 2 A? 6 i 0 "w 2 we V .1 6 m4 m i fiF mm 1 i. d i mn" #L d 1 w United States Patent GAS BURNER Harris A. Squire, ChagrinFalls, and Louis A. Sacha, In, East Cleveland, Ohio, assiguors toPerfection Stove Company, Cleveland, Ohio, a corporation of OhioApplication April 7, 1948, Serial No. 19,554

19 Claims. (Cl. 158-116) This invention relates to the class of gasburners. While it has to do, principally, with gas burners that areespecially suitable for use in domestic cooking stoves and ranges, it isalso applicable, in some forms, to gas burning heating stoves, furnaces,water heaters and the like.

One object of the invention is the production of a the provision of agas burner comprising sheet metal :3:

parts, and wherein certain of said parts are arranged to form inner andouter walls, or multiple walls, that are spaced apart a distancesubstantially no less than the thickness of said walls and which wallscontain the gas emitting ports. By such a multiple wall arrangement,$2.;

the requisite port depth, relative to port diameter, is effected in 'asheet metal construction.

Another object is to provide a gas burner in which the portion of theburner head that is subjected to in tense heat, is of multiple, spaced,wall construction, to the end that the gas inside the burner head iskept relatively cool, and backfiring into the mixer is accordinglyprevented to a large degree.

Another and similar object of the invention is to minimize fiash back,and what is known as noise of extinction, when the burner is turned 01f,by so constructing the burner head that a small chamber is providedwherewith the gas emitting ports communicate intermediate their innerand outer ends. The small quantity of gas thus segregated from the mainbody enclosed by the burner head gently issues from the ports after thegas supply to the burner is shut OE and is quickly and quietly consumedwithout explosive force sufiicient to cause flash back.

Another object of the invention is the economical production of a lightweight, durable gas burner of relatively simple construction involvingsheet metal parts that are capable of being easily and quickly producedwith precision and readily assembled.

Another object is to provide a gas burner that responds readily toheating requirements in that it heats up quickly when lighted and coolsrapidly when shut off. This results from the fact that the mass of theburner is of low heat retaining capacity.

All of the foregoing objects, with others that will appear as thisdescription proceeds, are attained in the several embodiments of theinvention illustrated in the accompanying drawings wherein similarreference characters designate like parts throughout the views.

In the drawings, Fig. 1 is a central vertical section through anassembly including one form of burner and mixer and a supporting frame,the burner being of the 2,711,215 Patented June 21, 1955 style having anannular head; Fig. 2 is a plan view of the burner shown in Fig. 1; Fig.3 is a sectional detail on the line 3-3 of Fig. 2; Fig. 4 is a plan viewof the mixer and supporting frame shown in Fig. 1; Fig. 5 is ahorizontal section through the mixer on the line 55 of Fig. 1; Figs. 6and 7 are central vertical sections through the annular heads andadjacent portions of the mixing tubes of burners similar to that shownin Fig. 1; Fig. 8 is a plan view, and Fig. 9 a side elevation, partly insection, of a circular head burner made in accordance with theinvention, the latter view including a modified form of mixer and thegas supply parts associated therewith; Fig. 10 is a sectional detail onthe line 10-10 of Fig. 8; Fig. 11 is a detail in elevation of the lowerend portion of the mixing or venturi tube and the part of the mixerincorporated therein of the burner shown in Fig. 9; Fig. 12 is a similarView of the cylindrical shutter of the instant mixer; Fig. 13 is ahorizontal section through said mixer on the line 1313 of Fig. 9; Fig.14 is a central vertical section through the head and adjacent portionof the mixing tube of a modified form of the circular head burner; Fig.15 is a plan of the burner shown in Fig. 14; Figs. 16 and 17 are viewscorresponding, respectively, to Figs. 14 and 15, of a further modifiedform of the invention; Fig. 18 is a fragmentary sectional sideelevation, and

Fig. 19 a plan view, of another modification of the circular headburner; Fig. 20 is a central vertical section through the upper portionof a burner wherein the head is of triple wall construction, the wallscontaining the gas emitting ports being spaced equal distances apart;Fig. 21 is a view similar to Fig. 20 of a modification of the triplewall burner head; Fig. 22 represents a side elevation, partly insection, of an elongated oven burner construc ted in accordance with theinvention; Fig. 23 is a bottom plan view of the burner of Fig. 22; Fig.24 is a section on the line 24 24 of Fig. 22; Fig. 25 is a perspectiveview of a baffle employed in the oven burnerdisclosed in the previousviews, and Fig. 26 is a fragmentary side elevational view of a modifiedform of oven burner.

In the assembly of Fig. 1, the burner unit is desig- 1 is made up of anouter inverted channel member or flanges or walls spaced from those ofthe outer shell ex-' cept where they flare outwardly and contact theflanges or walls of the outer shell or member some distance above thelower edges thereof. Inserted within the bottom of the outer member orshell with its inner and outer edges contacting the corresponding edgesof the inner member a is an annular bottom wall 41. This wall is alsoshown as a shallow channel in that its inner and outer edges are curvedupwardly, and at diametrically opposite locations, the bottom wall haselliptical apertures about which the material of the wall is turneddownwardly to provide shallow bosses Q The foregoing elements of theburner head are bound tightly together by bolts a that are projecteddownwardly through vertically aligned apertures in the top walls or websof the channel members or shells a and a and the bottom wall a and havenuts 11'' applied to their lower ends. As

or walls of the channel members or shells a and a and they are arrangedin two circumferential rows, the ports of the two rows desirably beingstaggered with respect to each other. While the inner and outer endportions of the ports are shown in direct alignment, this is found to beunnecessary, so far as satisfactory performance of the burner isconcerned. The inner walls or flanges er the members or shells a and aare shown as having a single row of ports n The ports may be punched ordrilled in the sheet metal of which the members or shells at and a aremade, and for the sake of durability, a metal is preferably used thatwill not deteriorate under intense heat, or corrode. Among metalsespecially suited for the purpose is stainless steel.

The mixing tube a is shown as generally Y-shaped, the branches thereofbeing curved, and gradually enurging toward their upper ends andassuming an elliptical shape and size that correspond in these respectswith the bosses a of the bottom wall a to which said branches are buttwelded. The stem of the mixing tube tapers downwardly and its circularlower end is also butt welded to the correspondingly shaped upper end ofa frusto conical portion or bell (2 This portion terminates at its lowerend in a cylindrical part that is fitted into a nestei' tube 0 to whichsaid part is fastened, as by welding. The nester tube n has an outwardlyextending flange 11 at its upper end. Please notice that the mixing tube(1 and the hell (1 constitute a venturi of common character. 7

The mixing tube 11 embracing the branches a and the tapered stem, ispreferably constructed of two ide'n tical sheet metal stampings, theedges of which are abutted and welded together, thus forming, in effect,an integral unit. Accordingly the tube is shown crossha'tched in Fig. 1,notwithstanding the fact that the plane of section coincides with thearea of contact between the two halves, as indicated by the line x inFig. 2.

The supporting frame C is Hshaped, and is constructed of strap metal ofsuitable width and thickness. It includes side members 0 that haveoutturned feet 0 provided with apertures for suitable fastening means bywhich the frame may be attached to a part of a stove or 7 otherstructure. Each side member is turned outwardly at its upper end to forma lug c that is provided with a relatively large hole. The side memberscf are tied together by a cross piece c which has its ends turned downand welded or otherwise fastened to the side mem ber's about midwaybetween their upper and lower ends.

Conduit means for supplying gas to the burner includes an elbow c and athreaded nipple 0 the latter being projected upwardly through a centralopening c in the cross piece a of the supporting frame. The flanged endof the elbow c engages the other side of said cross piece while a nutthat is threaded onto the nipple c is screwed down tightly against thecross piece to clamp the 'parts firmly to the supporting frame. Screwedonto the nipple c is a nozzle 0 of usual character having a gas emittingorifice 0 An outer stationary member b of the mixer B consists of acylindrical cup-like element having a flat bottom wall :5 provided witha central opening that is surrounded by an internal boss b that receivesthe nozzle e The upper end of said cup-like element is flanged outwardlyand shaped to provide arms b and lugs b (Fig. 4). The outer ends of thearms 12 overlie the lugs l: of the supporting frame C and have holesaligned'with those of said lugs and extended through the holes of bothare so-called push rivets, e that serve to firmly but detachably connectthe mixer to the supporting frame.

The shutter 12 of the mixer B is in the form of a cylindrical sleevethat has an easy working fit within the cylindrical portion of the outerstationary cup-like member b and at its upper end is provided with anoutwardly extending flange b Surrounding the shutter b and weldedtheretointermediate its ends is a ring-like member 12 which includeslaterally extending lobes I2 having equal to the radial spacing ofthreaded apertures in the' lugs b of the outer member b of the mixer.Screws 12 extend through the slots I1 and are threaded into theapertures of the lugs b and by holding engagement of the heads of thesescrews with the adjacent parts of the lobes Z1 the shutter may beimmovably secured to the outer member 12 in any adjusted position. Thecylindrical wall of the member b is provided with slots b (Fig. 5) thatoverride the slots I2 of the shutter b Thus it will be seen that, byrotating the shutter by means of the lobes I1 upon loosening the screwsb the slots 11 may be brought into any desired overlapping relation tothe slots 11 of the outer mixer member 12, thereby to properlyproportion the air supply to the gas supply issuing from the orifice 0In order to obtain an accurate minimum air supply, each of the slots 11is graduated by forming a rounded notch I7 in an end wall thereof.

The burner is properly positioned with respect to, and.

evident from this that the burner may be lifted out of the assembly andreturned thereto without disturbing the adjustment of the shutter.

in the form of the invention illustrated in Fig. 6, and generallydesignated A, the burner head is made up of an outer channel-like shell(1 and an inner channel-like shell a the radially spaced flanges orwalls of the former diverging for a part of their depth and thencontinuing to their lower edges in substantially cylindri cal form. Theinner and outer walls or flanges of the respective shells are spacedapart excepting where the lower edges of those of the inner shell arecurved toward and engage those of the outer shell at about the junctionof the tapered and cylindrical portions of the latter. The top walls orwebs of the two shells are shown in contact and as bound together byrivets a. A bottom wall a, in the form of a shallow downwardly openingchannel,

fits within the bottom of the outer shell n the lower edges of theradially spaced walls ofthe latter being welded to the adjoining flangesof the bottom Wall.

a of the bottom wall a.

walls or flanges of the shells n and n and with a single row of ports ain the inner walls or flangesthereof.

Another manner of constructing an annular burner head in accordance withthe invention is shown in Fig.

7, where an inner channel member or shell a is nested within an outerchannel member or shell a. Here, the

burner is designated, generally, by the reference charac The side walls'or flanges of the inner shell are ter A spaced from those of the outershell, excepting where the former are flared outwardly at their lowerends into contact with the adjacent portions of the outer shell; theinner wall or flange of the inner shell being shown somewhat deeper thanthe outer wall or flange thereof. Engaged upwardly within the outermember or shell a is an annular bottom wall a, the peripheral portion ofwhich} l is curved upwardly into engagement with the outer wall 7 orflange of the inner member or shell 21 The deeper" inner Wall or flangeof the inner shell meets the adjacent flat edge portion of the bottomwall a.

forming the lower edge portion c1 of the outer wall or flange of theouter shell downwardly about the complementarily curved peripheralportion of the bottom wall a. The shells a fand n have gas emittingports Y arranged as in the previously described forms of the invention.

Butt welded to shallow bosses af ofthe bottom wall in this case, the twoshells and the bottom wall are held together 'byf a are the upper endsof the branches of a Y-shaped mixing tube a, the present tube differingfrom those previously described in that edge flanges a are formed on thetwo sheet metal halves of the tube and are spot welded together.

In the form of the invention next to be considered, and which isillustrated in Figs. 8 to 13 and is designated, generally, by A acircular burner head (as distinguished from the annular type previouslydescribed) is constructed of an outer shell a and an inner shell a Thelower edge portion or" the former is flared outwardly to produce anannular horizontal flange that is curled downwardly at its periphery,while the corresponding portion of the inner shell :1, which inner shellis of considerably less depth than the outer shell, is curved outwardlyinto contact with the adjacent wall portion of the outer shell, therebyto properly space apart the major portions of the peripheral walls ofthe two shells. A circular bottom wall a has its edge portion curledupwardly so that the diameter of said wall is approximately the same asthat of the perimeter of the inner shell (1 Now, with the inner shellnested within the outer, and the bottom wall a engaged within the outershell and against the edge of the inner shell, the parts are boundtogether by two bolts 11 that are extended through aligned apertures inthe shells and bottom wall and have nuts a (Fig. applied to theirthreaded lower ends. The tapered head of each bolt seats within adepression formed by countersinking the portion of the top wall of theouter shell about the aperture through which the bolt extends, suchcountersunk 3 portion being accommodated by an enlarged aperture in thetop wall of the inner shell. The burner head is provided with gasemitting ports a, shown as arranged in two rows that extendcircumferentially about the head and penetrate the peripheral walls ofthe two shells, the ports in one row being staggered with respect tothose in the other.

Surrounding a central opening in the bottom wall a is a boss a This bossis formed by flanging the sheet metal of said wall downwardly about theabove mentioned opening, the boss being slightly downwardly convergentto closely embrace the reversely tapered upper end of a mixing tube (1This tube, which continues to taper to a somewhat smaller diameter atthe bottom, is formed of two sheet metal halves having edge flanges @2and a, respectively, that are engaged face-to-face and spot Weldedtogether, the flanges stopping short of the upper end of the tube topermit the above described connection between the tube and bottom wallat, the joint between the tube and said wall being welded.

Fitted into the lower end of the mixing tube i1 and welded or otherwisesecured thereto, is the appropriately shaped upper end of a bell a thatis desirably drawn from sheet metal and has a cylindrical extension a(Fig. 11) at its lower end that forms a part of the mixer designated,generally, by the reference character B. Rotatable upon the extension ais a cylindrical cup-like shutter b having diametrically opposed slots bin the peripheral wall that are adapted to override slots a in theextension a of the mixing tube. The slots b are shown as extending abovethe slots a (Fig. 9) and, at one of their top corners, as extendingbeyond the corresponding end of said slots 11 to accommodate screws bThese screws are threaded into holes a in the extension a so that theheads of the screws overlie the adjacent part of the shutter and serve,When the screws are drawn up tightly, to lock the shutter in position.

The bottom wall of the shutter b has a central aperture for thereception of a gas supply nozzle 0 incorporated in conduit means that isattached to a support e These parts may be the same as the supportingframe and gas supply means previously described, and illustrated in Fig.1.

It is apparent from the foregoing that, in the present case, the mixer Bis carried by the burner, and is removable and replaceable therewith onoccasions of inspection and cleaning of the burner. However, with theshutter [1 locked to the extension a of the mixing tube assembly, itsadjustment need not be disturbed during the removal, handling andreplacement of the burner.

The head of the burner A illustrated in Figs. 14 and 15, ditters onlyslightly from the circular burner head last described. The presentconstruction is somewhat simpler than the former in that the outer shella has a straight, downwardly divergent peripheral Wall, and the annularbottom wall a is flat and bears upwardly against the perimeter of theinner shell a when the latter and said bottom wall are inserted into theouter shell and are bound thereto by bolts 11 These bolts are extendedthrough aligned apertures in the two shells and bottom wall, and therounded heads thereof bear directly upon the top wall of the outershell. Nuts a' are threaded onto the lower ends of the bolts and bearagainst the bottom wall a The upper end of a mixing tube a projectsthrough a central opening of the bottom wall a that is surrounded by adepending flange n to which the tube is welded. The gas emitting portsof the burner head are designated a.

With reference to the head of the burner A illustrated in Figs. 16 and17, an inner shell 01 is nested within an outer shell a the lower edgeof the peripheral wall of the former being flared outwardly into contactwith the adjacent portion of the corresponding wall of the latter,whereby said wall of the inner shell is held in spaced relation to theperipheral wall of the outer shell. The two shells are fastened togetherby rivets that extend through aligned apertures in the top walls of theshells. A circular bottom wall a has an upstanding peripheral flange nthat is engaged with and welded to the underside of the outwardlyflanged lower end (I of the outer shell. In order to reduce the gasspace of the. present burner head, so as to avoid an undesirably largequantity of gas being present therein, the bottom wall a is made re- 75flange a of the outer shell.

entrant throughout its central region, and a central opening of saidwall is surrounded by 21 depending flange a. to which the upper end of amixing tube a is butt welded. Figs. 18 and 19 show a burner A whereinthe head is constructed of an outer shell 1 and an inner shell a theformer being gradually flared outwardly at its lower end into ahorizontal flange. The major portion of the peripheral wall of the innershell is spaced from the corresponding wall of the outer shell, whileadjacent its lower end the inner shell is flared into contact with, andfollows the contour of, the outer shell. (1 is a circular bottom wallthat is formed about its edge to fit within the flared lower end of theinner shell. The edge portion of the outer shell extends beyond thecorresponding portions of the inner shell and bottom wall and is crimpedthereabout to bind the shells and bottom wall firmly together. Gasemitting ports a extend through the spaced peripheral walls of theshells in two circumferential rows. To a shallow boss (1 that surroundsa central opening in the bottom wall 42 is butt welded the upper end ofa mixing tube at.

The burnerA shown in Fig. 20, is characterized by a triple wall headcomposed of an outer shell a an inner shell a and an intermediate shella The top walls of the three shells are engaged one with another and areheld together by rivets a while the major portions of the peripheralwalls of the shells are spaced apart. At their lower ends, theperipheral walls of the intermediate and inner shells are flaredoutwardly into contact with the adjacent portion of the correspondingwall of the outer shell, and below the bottom plane of the inner shell,said Wall of the outer shell curves outwardly and merges intoa'horizontal flange a the outer edge of which is curved downwardly. a isa circular bottom wall which has an upstanding edge flange a that isengaged with and welded to the underside of thehorizontal The bottomwall has a central opening surrounded by a depending flange a to whichis butt welded the upper end of a mixing tube r1 Gas emitting portscontinue through the peripheral walls of the three shells from theinterior to the exteriorof the burner head, the ports being designatedr1 Fig. 21 shows a burner, designated A incorporating another form oftriple wall burner head that is made up of nested outer and inner shells(1 and ri respectively, and an inverted cup-like member a The shells (1and (1 correspond to the outer and intermediate shells of the form ofthe invention last described, while the inverted cup-shaped member acorresponds to the inner shell. It includes a perforated cylindricalwall through which the gas is fed from the interior of the burner headto the space between the member a and the inner shell c Gas emittingports are formed in the inner and outer shells, as indicated at a andthe top walls of the member a and the two shells are fastened togetherby rivets a A bottom wall a similar to .the one last described, iswelded to the horizontal flange of the outer shell, and the upper end ofa mixing tube a is butt welded to a flange surrounding a central openingin said wall.

Figs. 22 to 25 show the invention incorporated in a burner A having anelongated head and which is of the class used in ovens, although aburner of this type may have more general application. Here the burnerhead consists of an outer shell 61 and an inner shell a each in the formof a long narrow pan. The shells are nested one within the other, andthe peripheral wall of the inner shell is spaced from the correspondingwall of the outer shell. The peripheral walls of the two shellsterminate at their tops in flat horizontal flanges arranged with the oneon the inner shell overlying that of the outer shell, and both flanges,and accordingly the shells, are held firmly together by the crimped overedge portion 4: of a top wall a Gas emitting ports 41 extend through theperipheral wall of the shells. The upper end of a mixing tube a iswelded to the bottom wall of the outer shell about a central opening atherein that registers with an opening a in the bottom wall of the innershell. To better distribute the gas throughout the length of the head,and in order to avoid too much gas issuing from the ports in theimmediate vicinity of the mixing tube, a baflle 11 is disposed Withinthe head, the same being shown in the form of a channel (Fig. 25) theweb of which has an opening [1 that registers with the openings in thebottom walls of the shells. The bathe is suitably connected, as bywelding, to the inner shell.

The mixing tube is shown as curved and as terminating at its ends remotefrom the burner head in a hell 4: having a cylindrical extension onwhich is mounted a cylindrical cup-like shutter a of a mixer B similarto that shown in detail in Figs. 9 and ll to 13.

A modification of the so-called oven burner, shown in Fig. 26 anddesignated A includes an elongated burner head practically identicalwith the one last described. To the bottom wall of an outer shell a nearone end of the burner head, is attached a mixing tube (1 In this case,the ports a extend along the sides of the burner head and about the endthereof remote from the mixing tube but not around the end adjacent thelatter, as otherwise a preponderance of gas would escape from the burnerhead in the immediate vicinity of said tube. Consequently, there is noneed of a baflle in the present head, as was the case with thepreviously described modiflcation.

In connection with those embodiments of our invention incorporating thehorizontal flange that surrounds the lower portion of the burner head(as disclosed herein in Figs. 9, 16, and 18, for example), we mayexplain that said flange serves as a drip rim, as well as asupportingpart for the burner in certain kinds of installations. It, in no wayaffects the operation of the burner.

Having thus described our invention, what we claim is:

1. A gas burner including a hollow head comprising thereto.

an outer'endless channe'l'member and a similar inner;- channel membernested within the former channel .mem-J her, the webs of the channelmembers being engagedwith each other while the flanges of the inner.channel mom-1 her are spaced from the flanges of the outer member, theflanges of the inner and outer members being provided with gas emittingports, and an annular wall closingv the.

open sides of the channel members and, with the inner channel member,enclosing the gas space of the burner.

head, the head including means for admitting a gaseous mixture to saidspace. 2. A gas burner including a head comprising a down side of theouter member, a bottom wall occupying the.

open side of the outer channel member and having its edge portionsengaged with the flanges of the inner channel member whereby said bottomwall and the innerv channel member enclose the gas space of the burnerhead, and means for securing the channel members and.

bottom wall together, the head including means for ad-, mitting agaseous mixture to said gas space.

3. A gas burner according to claim 2, wherein the outer edge of thebottom wall is :curved upwardly into contact with the outer flange ofthe inner channel member, and the edge portion of the outer flange ofthe outer channel member is contracted about the outer edge por-.

tion of the bottom wall thereby to bind the channel members and bottomWall together.

4. A gas burner including a head comprisingadown-i wardly openingannular outer. channel member and a similarly shaped and arranged innerchannel member nested, within the outer channel member, the webs of: themembers being engaged with each other while the fianges'of the innerchannel member are spaced from the flanges of the outer member, theflanges of the inner and outer members being provided with gas emitting;1

ports, the inner channel member havingthe edge portions of, itsflangesflared toward and engaged with the flanges of the outer member in spacedrelation to the open side of the outer member, and an annular bottomwall occupying the open side of the outer channel mem-.

her and having its edge portions engaged with the flanges of the innerchannel member, and means for securing the channel members and bottomwall together, the bottom wall having substantially diametricallyopposed tubev openings for the application of a branched mixing 5. A gasburner according to claim 4, wherein the openings in the bottom wall areelliptical with their shorter axes extendingdiametrically of the burnerhead.

6. A gas burner according to claim 4, wherein the outer 7 it edge of thebottom wall is curved upwardly into contact with the outer flange of theinner channel member, and the edge portion of the outer flange of theouter channel member is contracted about the outer edge portion of thebottom wall thereby to bind the channel members and 1, bottom walltogether. 7. A gas burner including a hollow head comprising an outerdownwardly opening, annular sheet metal channel member, a similar innerchannel member nested within the outer channel member and having itsflanges spaced inwardly from those of the outer member, the flanges ofthe inner and outer members being provided with gas 1 emitting. ports,the inner channel member being of less depth than the outer channelmember and having theedge portions of its flanges flared toward and incontact 5 with the flanges of the outer member, the webs of the,

channel members being engaged with each other, an annular bottom wallwithin the open bottom of the outer channel member and having inner andouter edge flanges secured to the flanges of the outer member, saidbottom wall having substantially diametrically opposed openings, anddepending flanges surrounding said openmgs.

8. In a gas burner, a hollow head comprising two annular sheet metalelements, the first of said elements being of channel formation andincluding a top wall, a peripheral wall, and an inner wall, the secondof said elements constituting a bottom wall having its outer edgeconnected to the lower edge of said peripheral wall and its inner edgejoined to the lower edge of said inner wall, and a sheet metal ring-likemember nested in the first mentioned element and having an annularportion engaged with and secured to said top wall and a dependingperipheral wall substantially parallel to the surrounding portion of thefirst mentioned peripheral wall and in contact therewith adjacent thelower edge of said member, said peripheral walls being provided with gasemitting ports.

9. In a gas burner, a hollow head comprising two annular sheet metalelements, the first of said elements being of channel formation andincluding a substantially flat top wall, a downwardly divergingperipheral wall, and an inner wall, the second of said elementsconstituting a bottom wall having its outer edge connected to the loweredge of said peripheral wall and its inner edge joined to the lower edgeof said inner wall, a sheet metal ring-like member nested in and securedto the first described element and having a substantially flat annularportion engaged with said top wall and a downwardly divergent peripheralwall substantially parallel to and spaced from the surrounding portionof the first mentioned peripheral wall and flared outwardly adjacent itslower edge into contact with the latter, said peripheral walls beingprovided with gas emitting ports.

10. In a gas burner, a hollow head comprising two annular sheet metalelements, the first of said elements being of channel formation andincluding a substantially flat top wall, a downwardly divergingperipheral wall, and an inner wall, the second of said elementsconstituting a bottom wall having its outer edge connected to the loweredge of said peripheral wall and its inner edge joined to the lower edgeof said inner wall, a sheet metal ring-like member nested in the firstdescribed element and having a substantially flat annular portionengaged with said top wall and a downwardly divergent peripheral wallsubstantially parallel to and spaced from the surrounding portion of thefirst mentioned peripheral wall and flared outwardly into contacttherewith adjacent the lower edge of said member, said peripheral wallsbeing provided with gas emitting ports, the top wall and underlyingportion of said ring-like member having registering apertures that arespaced apart about the head, and fastening means extending through saidapertures and binding said member to the top wall.

11. In a gas burner, a hollow head comprising two annular sheet metalelements, the first of said elements being of channel formation andincluding a substantially fiat top wall, a downwardly divergingperipheral wall terminating at its lower end in a cylindrical portion,and an inner wall that extends generally downwardly and inwardly fromthe top wall, the second of said elements constituting a substantiallyflat bottom wall having a depending peripheral flange that fits withinthe lower end of said peripheral wall and is joined thereto, the inneredge of said bottom wall being connected to the lower edge portion ofthe aforesaid inner wall, and a sheet metal ring-like member nested inthe first element and having an annular flat portion engaged with andsecured to said top wall, and a downwardly divergent peripheral wallsubstantially parallel to and spaced from the surrounding portion of thefirst mentioned peripheral wall and flared outwardly at its lower endinto contact with 10 the adjacent portion of said first mentionedperipheral wall, said peripheral walls being provided with gas emittingports.

12. In a gas burner, a hollow head comprising two annular sheet metalelements, the first of said elements being of channel formation andincluding a substantially fiat top wall, a downwardly divergingperipheral wall terminating at its lower end in a cylindrical portion,and an inner wall that extends generally downwardly and inwardly fromthe top wall, the second of said elements constituting a substantiallyflat bottom wall having a depending peripheral flange that fits withinthe lower end of said peripheral wall and is joined thereto, the inneredge of said bottom wall being connected to the lower edge portion ofthe aforesaid inner wall, and a sheet metal ring-like member nested inthe first element and having an annular fiat portion engaged with saidtop wall, and a downwardly divergent peripheral wall substantiallyparallel to and spaced from the surrounding portion of the firstmentioned peripheral wall and flared outwardly at its lower end intocontact with the adjacent portion of said first mentioned peripheralwall, said peripheral walls being provided with gas emitting ports, thetop wall and underlying portion of said ring-like member havingregistering apertures that are spaced apart about the head, andfastening means extending through said apertures and securing saidmember to the first mentioned element.

13. In a gas burner, a hollow head comprising an outer relatively thinsheet metal shell including a flat wall portion and a peripheral wallthat extends from the edge of, and entirely about, said flat wallportion and is disposed at an angle thereto, and an inner relativelythin sheet metal shell nested within the outer shell and surrounding thegas space of the burner head and having a substantially fiat wallportion engaged with said flat wall portion of the outer shell, theinner shell including a peripheral wall that extends entirely about andfrom the edge of its flat wall portion in substantially parallelrelation to the peripheral wall of the outer shell and that is spaced auniform distance substantially no less than its thickness from the lastmentioned wall, the shells being in contact with each other entirelyabout the burner head adjacent the edge portion of the peripheral wallof the inner shell remote from its flat wall portion, the

spaced apart substantially parallel portions of the periph- Y eral wallsof the shells being provided with gas emitting ports, the ports of oneof said wall portions registering with those of the other wall portionthrough the intervening space, each port in the inner shell having across sectional area substantially equal to that of the registering portof the outer shell, the space between said peripheral walls providing agas diflfusing chamber, and a wall disposed across and closing the opensides of the shells, the burner head having an opening for admitting agaseous mixture to said gas space. 7

14. In a gas burner, the combination and arrangement of parts set forthin claim 13, wherein each of said shells is dish-shaped.

15. In a gas burner, the combination and arrangement of parts set forthin claim 14, wherein the edge portion of the peripheral wall of saidouter shell is flared to provide an exposed flange that surrounds theburner head.

16. In a gas burner, the combination and arrangement of parts set forthin claim 14,'wherein the edge portion of the peripheral wall of theinner shell is flared to provide a flange wherewith is engaged themarginal portion of the wall that is disposed across the open sides ofthe shells, the edge portion of the peripheral wall of the outer shellbeing crimped about said marginal portion and the aforesaid flange ofthe inner shell and shaped adjacent thereto to conform to thecorresponding portion of the inner shell.

' 17. In a gas burner, the combination and arrangement of parts setforth in claim 13, wherein each of said shells is in the form of arelatively narrow elongated pan.

18. In a gas burner, the combination and arrangement of parts set forthin claim 17, wherein the edge portion of the peripheral wall of eachshell is flared to provide a flange that is in a plane substantiallyparallel to the plane of the fiat wall portion of the shell, the flangesof the shells being engaged with each other, and the marginal portion ofthe wall that is disposed across the open sides of the shells is crimpedabout said flanges.

19. In a gas burner, the combination and arrangement of parts set forthin claim 17, wherein the opening for admitting a gaseous mixture to thegas space of the burner head is located with its projected axisintermediate opposed side portions of the peripheral wall of the innershell a substantial distance from each end of the burner head, andbaffie parts disposed between said opening and the ports in the adjacentopposed side portions of the peripheral wall of said inner shell.

Jackson Jan. 20, 1885 Dean Nov. 8, 1892; Petersen et a1 June 27, 1905Park May 25, 1909 Benson June 18, 1918 Torrey Aug. 30, 1921 Keith Apr.25,1922 Bierce Jan. 20, 1925' McCoy Jan. 5, 1932 Forberg Jan. 26, 1937'Hurlbut et al Apr. 3, 1945 Pratt May 15, 1945- Bechtold May 2, 1950FOREIGN PATENTS 1 Great Britain of 1898 Great Britain Jan. 25, 1917Great Britain June 21, 1938 1

